package main

import "fmt"

func main() {
	a := []int{1, 2, 3, 4, 5} //  4, 5 输出也没变化
	s := a[0:3:5]
	fmt.Println("s = ", s)
	fmt.Println(" len(s) = ", len(s)) //长度  3 - 0
	fmt.Println(" cap(s) = ", cap(s)) //容量  5 - 0

	s = a[1:4:5]
	fmt.Println("s = ", s)            //从下标1开始，取4-1 = 3个
	fmt.Println(" len(s) = ", len(s)) //长度  4 - 1
	fmt.Println(" cap(s) = ", cap(s)) //容量  5 - 1
}
